Raytheon Pathfinder 1200 Instruction Manual page 18

2-2
In ON position, (with the READY light glowing) the system is transmitting, and
any echoes from targets received are amplified and displayed on your screen.
2) RANGE
The seven RANGE switches select the scale which you wish the radar to display.
The range selected automatically determines the proper number and calibrated
distance between the range rings and the proper transmission pulse length as shown
in Table 2-1.
TABLE 2-1 RELATION OF RANGE, RINGS AND PULSE LENGTH
Range Range Rings Interval
Number of Rings
Pulse Length
(nm)
(nml
(~s)
0.25 0.125 2
0.12
0.5 0.25 2 0.12
I I
0.25 4
0.12
2 0.5 4 0.12
4
I 4
0.5
8
2 4
0.5
12 3
4
0.5
3)
TUNE
The TUNE control allows you to maximize target echoes by "fine" tuning of the
local oscillator which is located in the Scanner Unit.
4)
GAIN
The GAIN control varies the amplification in the receiver, and thus the strength of
echoes as they will appear on the screen.
5)
SEA CLUTTER
The SEA CLUTTER control reduces the gain level at short range only.
6)
RAIN CLUTTER
The primary use of RAIN CLUTTER is to break up the returns from rain or snow
thus allowing weaker targets to become visible.
7) SHM MARKERS (SHM, MARKERS - SHM - MARKERS - OFF)
The SHM MARKERS switch is a four position switch which selects the SHM, markers,
both or none for the display.
8)
CRT BRIL
The CRT BRI LLiANCE controls 4 levels of the screen brightness.
9)
IR
The IR switch turns the interference rejecter "on" to eliminate interference from
other ship radars.
10) HOLD
The HOLD switch is used to temporarily "freeze" the picture on the screen to assist
the operator in determining bearing and ranges. Pushing the HOLD switch stops the
transmission of
RF
power releasing the switch restores normal operation.
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